23081209 has 2 divisors, whose sum is σ = 23081210. Its totient is φ = 23081208.

The previous prime is 23081203. The next prime is 23081249. The reversal of 23081209 is 90218032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23040000 + 41209 = 4800^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 23081209 - 2⁹ = 23080697 is a prime.

It is not a weakly prime, because it can be changed into another prime (23081203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11540604 + 11540605.

It is an arithmetic number, because the mean of its divisors is an integer number (11540605).

Almost surely, 2^23081209 is an apocalyptic number.

It is an amenable number.

23081209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23081209 is an equidigital number, since it uses as much as digits as its factorization.

23081209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 23081209 is about 4804.2906864593. The cubic root of 23081209 is about 284.7210114831.

The spelling of 23081209 in words is "twenty-three million, eighty-one thousand, two hundred nine".